When you're looking for an inexpensive way to upgrade and control boost on your WRX or STi it's hard to go past these awesome little boost controllers from AVO. Designed for rock solid boost control and with super sharp response these are one of the best bang for the buck boost controllers on the market. With two boost presets which you can switch between easily, a 3 port solenoid and a compact control unit which is easy to mount anywhere in the cabin, these AVO boost controllers are hard to go past!

Sorry - I think I missed this post. The install is very straightforward - essentially power and earth and a wires for the map sensor and solenoid. There's pretty straightforward instructions in english which make it all very easy.